EP0606038B1 - Dispositif d'enduction au rideau avec évacuation du bord - Google Patents

Dispositif d'enduction au rideau avec évacuation du bord Download PDF

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Publication number
EP0606038B1
EP0606038B1 EP93420509A EP93420509A EP0606038B1 EP 0606038 B1 EP0606038 B1 EP 0606038B1 EP 93420509 A EP93420509 A EP 93420509A EP 93420509 A EP93420509 A EP 93420509A EP 0606038 B1 EP0606038 B1 EP 0606038B1
Authority
EP
European Patent Office
Prior art keywords
curtain
blade
edge
support
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93420509A
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German (de)
English (en)
Other versions
EP0606038A1 (fr
Inventor
Kenneth John C/O Eastman Kodak Company Ruschak
James Edward C/O Eastman Kodak Company Conroy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0606038A1 publication Critical patent/EP0606038A1/fr
Application granted granted Critical
Publication of EP0606038B1 publication Critical patent/EP0606038B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/04—Curtain coater

Definitions

  • the present invention relates to a method and apparatus for coating objects or moving supports, advancing continuously past a coating station, by the curtain coating method. More particularly, it relates to an improved curtain coating method and apparatus for the manufacture of photographic materials such as photographic film and paper.
  • the moving support is coated by causing a free falling curtain of coating liquid to impinge onto the moving support to form a layer on said support.
  • An apparatus is described and used in U.S. Patent No. 3,508,947 wherein a multilayer composite of a plurality of distinct layers is formed on a slide hopper and caused to impinge onto an object or moving support to form a coated layer thereon.
  • U.S. Patent No. 3,508,947 particularly relates to the manufacture of multilayer photographic materials such as photographic film and paper.
  • the edges of the curtain In the coating of photographic products it is necessary to constrain the edges of the curtain to eliminate narrowing of the curtain and a reduction in coating width. It is desirable to have the edges of the curtain be internal to the edges of the film or paper base, henceforth this will be referred to as internal edging. Internal edging is preferable to the practice of maintaining a curtain wider than the base and coating over the edges of the base.
  • the edge guides are solid surfaces which slow the coating liquids because of drag they produce. This reduction in velocity results in a significant penalty in the maximum coating speed attainable near the edge.
  • the prior art teaches introducing a lubricating layer of water, or another low viscosity liquid, along the edge guide to reduce the drag and increase the velocity of the coating solutions in the curtain.
  • This water layer or low viscosity liquid layer must, however, be removed in order to maintain acceptable coating latitude and quality and to avoid any penalty in speed for drying the edges.
  • the velocity of the coating liquids must not be reduced in the vicinity of the edge if high speed coating is desired.
  • the prior art teaches the use of a vertical slit connected to a vacuum source at the bottom of the edge guide as the means by which the lubricating water is removed. This is described in U.S. Patent 4,830,887. This technique tends to slow down the coating liquids as the lubricating layer is being removed, hence reducing the maximum attainable coating speed at the edge. Also, some lubricating liquid may flow beyond the slit and not be captured.
  • EP-A-176,632 describes a curtain coating device having liquid removal means for extracting liquid from an edge region of a free falling liquid curtain.
  • Said removal means comprises a plate intercepting a side edge of the liquid curtain and directing the liquid outside the support. Said plate is in contact with the edge of the support to deflect it.
  • WO-A-90/01179 describes a curtain coating apparatus having liquid removal means for extracting liquid from an edge region of a free falling curtain.
  • Said liquid removal means comprises a plate which abruptly interrupts the falling of an edge portion of the curtain and deflects it towards the outside of the support.
  • the plate is distant from the support and outwardly downwardly inclined.
  • the extracted liquid is collected in catch basins.
  • the plate is tilted downwards towards the edge guide and purging liquid is provided on the plate to minimize any tendency for solids from the curtain liquids droping on the edges of the blade. This orientation facilitate the formation of drips from the bottom surface of the plate.
  • the present invention is defined in the claims and concerns a method and apparatus by which the lubricating layer of liquid and/or edge of the curtain in a curtain coating operation are removed very abruptly and efficiently. This is achieved by having the lubricating liquid and optionally, an adjacent narrow section of the curtain fall onto a thin solid blade. The lubricating liquid and curtain which impinge on the blade are then vacuumed away. This allows the remaining curtain to coat with little or no reduction in velocity due to the removal of the edge band of the falling curtain.
  • Figure 1 shows a front view of a prior art edge guide and falling curtain.
  • Figure 2 shows a perspective view of the blade/vacuum assembly of the present invention.
  • Figure 3 shows a front perspective view of a curtain and the blade/vacuum assembly of the present invention.
  • Figure 4 shows a side view of the blade/vacuum device of the present invention and its position relative to a support.
  • Figure 5 shows the blade/vacuum device of the present invention and the liquid path in the vacuum body.
  • Figure 1 illustrates how momentum at the edge of a curtain is lost in a prior art curtain coater when a lubricating liquid is removed.
  • Figure 1 shows curtain 10 and two prior art edge guides 12 guiding the curtain from the hopper lip 13 to the support 16 to be coated. As the curtain 10 leaves the hopper lip 13 it falls until it impinges upon moving support 16. The curtain is guided at its edges by edge guides 12.
  • the edge guides include a lubricating liquid introduction point 14 for introducing a lubricating liquid layer or band 14a at the edge of the curtain. However, this lubricating band is preferably removed prior to coating the support.
  • the lubricating liquid is removed by a vertical vacuum slot in fluid communication with the vacuum inlet 15 which can act to reduce velocity at the edge of the curtain.
  • the curtain liquids tend to move into closer proximity to the edge guide and hence are affected to a greater degree by drag.
  • This can create non-uniformities at the edges of the support 16 which has been coated by the curtain 10 as the momentum of the coating solutions near the edge are reduced.
  • the curtain can fail to wet the support completely.
  • the edge of the coating may then be ragged and may contain air bubbles. Drops of coating composition can also be created at the point where the edge of the curtain strikes the support. These may create contamination, streaks in the coating, and other process problems.
  • FIG. 2 Shown in Figure 2 is a perspective view of the device of the present invention from behind the curtain 10.
  • Figure 3 shows a front perspective view of the present invention.
  • Figure 2 shows a blade 20 attached to the edge guide 12 described in US-A-5,328,726. Blade 20 extends inward and intercepts the curtain 10. Attached to the blade is a vacuum tube 21 which removes all of the liquids intercepted by the blade 20. The liquids which impinge on the blade are drawn away through the vacuum tube 21 through vacuum slot 22. The liquids which do not contact the blade continue with very little velocity reduction until they impinge on the support 16.
  • the width W of the curtain liquids which impinge on the blade 20 can be varied by adjusting the position of the device with respect to the curtain.
  • the width W is adjusted by the position of pin 23 which positions the edge guide 12, although other methods are possible.
  • a similar pin at the top of the edge guide also has to be adjusted for the edge guide to remain vertical. It is preferable that at least some of the coating liquids be removed to insure that all of the lubricating layer is removed. Edge non-uniformities in the coating liquids originating in the hopper and on the hopper slide can also be removed in this manner. Below blade 20, the free edge of the curtain makes an angle ⁇ (not shown) with respect to the vertical.
  • the blade 20 of the edge removal device is tilted downwards toward the coating roll, in the direction of the center of the curtain and in the plane of the curtain. This is shown in Figure 3. In this preferred orientation drips cannot occur from the bottom surface of the blade as the liquid cannot run back beneath the blade. If the blade has no inclination in the plane of the curtain as shown in Figure 2, or if it is inclined upwards away from the coating roll in the direction of the main body of the curtain and in the plane of the curtain, no vacuum removal means is required, as the edge liquids intercepted by the blade will flow down the blade by gravity, away from the edge of the coating, and can be collected.
  • a blade tilted toward the coating roll at approximately 30 degrees in the direction of the main body of the curtain and in the plane of the curtain and a suction removal means is preferred.
  • FIG. 5 shows the evacuation path of the solutions that contact the blade 20.
  • the curtain 10 falls just behind a vacuum slot 22, i.e. approximately 1 mm from the slot 22, which is open on the two perpendicular faces of the vacuum body.
  • the liquids enter the vacuum body through the vacuum slot 22 and then are channelled through an internal vacuum slot 32, vacuum cavity 33 and vacuum tube 21 which is connected to the vacuum source.
  • the internal vacuum slot 32 and cavity 33 are designed to obtain uniform vacuum potential along the vacuum slot 22.
  • the blade is preferably corrosion resistant metal, such as stainless steel or titanium alloy.
  • the blade and vacuum body were made of titanium.
  • the blade is preferably thin to help minimize the distance between the top surface of the blade and the support at the blade's edge (the point of curtain breakoff), and to minimize drag on the edge of the curtain formed at the blade's edge.
  • Metal blades 0.1 - 0.25 mm thick perform well and have adequate mechanical integrity.
  • the top surface of the blade is preferably smooth enough that flow of liquids is not impeded.
  • the bottom surface of the blade is preferably polished to minimize wetting of the bottom surface.
  • blade finish is not crucial to operation of the invention.
  • the working edge of the blade is machined square, no attempt is made to sharpen the blade for safety reasons.
  • the width and height of the vacuum slot are chosen, along with vacuum level and capacity to insure that all of the intercepted edge band is removed.
  • the width of the vacuum slot is comparable to the width of the intercepted edge band.
  • the slot width can be as small as 50% of the curtain removal width. As the slot width becomes much greater than the curtain width a higher vacuum level is required to handle the extra volume of air drawn into the slot which extends outboard of the curtain edge.
  • a slot height of about 0.5 mm has been found to provide sufficiently uniform vacuum potential around the slot without unduly high resistance to flow.
  • a single layer application of 50 centipoise aqueous gelatin solution with surfactant and 1.65 cc/cm/sec total flow rate was curtain coated.
  • the application angle ⁇ used was +30 degrees and the support coated was gelatin-subbed polyethylene terephthalate.
  • the speed was gradually increased until wetting failure occurred at the edge.
  • Two different edge guide configurations were used: a slotted tube (prior art); and an edge guide with a blade removing 4 mm of curtain solutions and all the lubricating liquid, which was water.
  • the maximum attainable speed was 480 cm/sec. At this point the edge entered wetting failure and the speed could no longer be increased.
  • the maximum attainable speed was 660 cm/sec. At this point the edge entered wetting failure.
  • the maximum attainable coating speed for this curtain sufficiently far from the edge as to be unaffected by the edge guide was 700 cm/sec.
  • the invention provided a 37.5% increase in maximum coating speed attainable in the center of the curtain.
  • An increase in coating speed in manufacturing of this magnitude would greatly improve efficiency of the operation and increase the capacity of the plant.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (11)

  1. Moyen d'évacuation de liquide destiné à extraire du liquide depuis une région de bord d'un rideau de liquide tombant librement, pouvant être fixé à un guide de bord, comprenant :
       une raclette (20) présentant une surface supérieure et s'étendant depuis un bord du rideau tombant librement afin d'intercepter une partie du rideau tombant librement, ladite raclette ne venant pas en contact avec un support (16), et caractérisé par :
    une fente (22) alignée avec la surface supérieure de ladite raclette et adjacente à celle-ci, espacée de l'interception de la partie du rideau tombant librement par ladite raclette, ladite fente s'ouvrant sur deux côtés pratiquement parallèles, l'un parallèle au rideau et en regard dudit rideau et l'autre perpendiculaire audit rideau et à l'opposé du guide de bord, et
    un moyen d'aspiration (21) destiné à appliquer un vide à ladite fente de façon que la totalité du liquide formant la partie du rideau tombant librement intercepté par ladite raclette soit aspiré par l'intermédiaire de ladite fente.
  2. Dispositif selon la revendication 1 dans lequel la raclette est une raclette à bord et la fente s'étend à l'intérieur du bord de ladite raclette.
  3. Dispositif selon la revendication 1 ou 2 dans lequel la raclette s'étendant jusque dans le rideau tombant librement peut être réglée (23) de sorte que la partie du rideau interceptée est variable.
  4. Dispositif selon l'une quelconque des revendications 1 à 3 dans lequel ladite raclette est inclinée par rapport au rideau tombant librement de façon que ladite raclette (20) soit le plus proche du support (16) là où le rideau est intercepté et le plus loin du support au niveau du guide de bord.
  5. Dispositif selon la revendication 4 dans lequel la raclette est inclinée d'approximativement 30° par rapport à l'horizontale.
  6. Dispositif destiné au couchage au rideau d'un support par dépôt d'un ou plusieurs liquides de couchage sur un support en mouvement (16) comprenant :
    un moyen de transport comprenant un rouleau de couchage destiné à déplacer ledit support présentant une largeur suivant un trajet à travers une zone de couchage,
    un hopper destiné à former une ou plusieurs couches fluides de liquides de couchage afin de former un rideau tombant librement qui s'étend transversalement audit trajet et tombe sur ledit support en mouvement (16),
    un guide de bord (12) espacé d'une certaine distance afin de produire un couchage inférieur à la largeur dudit support, destiné à guider latéralement ledit rideau tombant,
    un moyen de rinçage destiné à émettre du liquide à partir du guide de bord afin de maintenir un contact mouillant avec ledit rideau tombant, et
    un moyen d'élimination de liquide selon l'une quelconque des revendications 1 à 5.
  7. Dispositif selon la revendication 6, dans lequel un bord du moyen d'élimination de liquide est positionné approximativement à 1 mm dudit support.
  8. Dispositif selon la revendication 6 ou 7 dans lequel la partie du rideau tombant librement qui est interceptée par ladite raclette s'écoule le long d'une face avant de la raclette depuis l'extrémité supérieure jusqu'à l'extrémité inférieure dans laquelle la partie du rideau tombant librement qui est interceptée est éliminée par ledit moyen d'aspiration.
  9. Dispositif selon l'une quelconque des revendications 6 à 8 dans lequel ladite raclette est inclinée jusque dans le rideau tombant librement de façon que la raclette soit le plus proche du support là où le rideau est intercepté et le plus loin du support au niveau du guide de bord.
  10. Dispositif selon l'une quelconque des revendications 6 à 9 dans lequel ladite fente est espacée d'approximativement 1 mm de l'interception de la partie du rideau tombant librement par ladite raclette.
  11. Dispositif selon l'une quelconque des revendications 6 à 10 dans lequel la fente présente une hauteur d'approximativement 0,5 mm.
EP93420509A 1993-01-07 1993-12-23 Dispositif d'enduction au rideau avec évacuation du bord Expired - Lifetime EP0606038B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US148593A 1993-01-07 1993-01-07
US1485 1993-01-07

Publications (2)

Publication Number Publication Date
EP0606038A1 EP0606038A1 (fr) 1994-07-13
EP0606038B1 true EP0606038B1 (fr) 1999-08-18

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EP93420509A Expired - Lifetime EP0606038B1 (fr) 1993-01-07 1993-12-23 Dispositif d'enduction au rideau avec évacuation du bord

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US (1) US5395660A (fr)
EP (1) EP0606038B1 (fr)
JP (1) JP3476889B2 (fr)
DE (1) DE69326056T2 (fr)

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DE19513531A1 (de) * 1995-04-10 1996-10-17 Du Pont Deutschland Verfahren und Vorrichtung zur Verminderung von Störungen beim Vorhanggießen
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US5691123A (en) * 1995-06-30 1997-11-25 Eastman Kodak Company Method to selectively remove lubricant from one side of lubricant-coated support
US5763013A (en) * 1997-02-05 1998-06-09 Eastman Kodak Company Edge removal apparatus including air-flow blocking means for curtain coating
US5725910A (en) 1997-02-05 1998-03-10 Eastman Kodak Company Edge removal apparatus for curtain coating
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DE59702151D1 (de) * 1997-10-03 2000-09-14 Troller Schweizer Engineering Verfahren und Apparatur zur Vorhangbeschichtung eines bewegten Trägers
US5885660A (en) * 1998-01-22 1999-03-23 Eastman Kodak Company Coating surfaces with a free falling coating composition, using a basin with a wall dividing the basin into two channels
US6117236A (en) * 1998-03-18 2000-09-12 Eastman Kodak Company Curtain coating apparatus and method with continuous width adjustment
US5976251A (en) * 1998-12-17 1999-11-02 Eastman Kodak Company Inlet for introducing water to wire edge guides for curtain coating
DE19962844A1 (de) * 1999-12-23 2001-07-05 Bachofen & Meier Ag Maschf Verfahren und Vorrichtung zum Beschichten einer laufenden Materialbahn
DE10117668A1 (de) * 2001-04-09 2002-10-10 Bachofen & Meier Ag Buelach Vorrichtung zum Beschichten einer laufenden Materialbahn
DE50209547D1 (de) 2002-09-10 2007-04-05 Ilford Imaging Ch Gmbh Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers
DE10333121B4 (de) * 2003-07-21 2006-01-19 Kodak Polychrome Graphics Gmbh Vorrichtung und Verfahren zum Beschichten von Material
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EP1900441B1 (fr) * 2006-09-15 2012-05-30 Ricoh Company, Ltd. Appareil de revêtement de rideaux coulissants et procédé de revêtement de rideaux coulissants
WO2008076743A1 (fr) * 2006-12-19 2008-06-26 Dow Global Technologies Inc. Procédé de revêtement de rideau utilisant un fluide de guidage de bord
JP5491492B2 (ja) * 2008-03-26 2014-05-14 スリーエム イノベイティブ プロパティズ カンパニー 複数ユニットポリマー前駆体を含有するスライド塗布液の方法
BRPI0910877A2 (pt) * 2008-03-26 2015-10-06 3M Innovative Proferties Company método para aplicar dois ou mais fluidos como um revestimento de deslizamento
BRPI0910075A2 (pt) * 2008-03-26 2015-12-29 3M Innovative Properties Co métodos para aplicar dois ou mais fluidos como um revestimento de deslizamento
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JP5169571B2 (ja) * 2008-07-22 2013-03-27 株式会社リコー カーテン塗布方法及び装置
EP2412446A1 (fr) 2010-07-30 2012-02-01 Polytype Converting S.A. Guide de bord pour procédé d'enduction par rideau
KR102515254B1 (ko) * 2023-01-16 2023-03-30 황정석 발수 코팅 처리된 원단을 이용한 커튼 및 이의 제조 방법

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Also Published As

Publication number Publication date
EP0606038A1 (fr) 1994-07-13
US5395660A (en) 1995-03-07
DE69326056D1 (de) 1999-09-23
JPH06233954A (ja) 1994-08-23
DE69326056T2 (de) 2000-02-24
JP3476889B2 (ja) 2003-12-10

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